Piston-guiding means



July l, 1930. J. c. L ARY a PISTON GUIDING MEANS- Filed Dec. 17, 1923 2Sheets-Sheet 1 III, l-IIIII V INVENTOR. JCZIHRK;

- ATTORNEY.

July l, 1930. y

2 Sheets-Sheet 2 I J. LEARYV PISTON` GUIDING MEANS INVENTOR. J C'. &mn

&gd/104105) ATTORNEY Patented July 1930 WWASTA S.

;PATNT ow-;e V

JOHN c. LEA Y; Q sANFRAncIsco, CALFO IA PISON-GUIDINGMEANS.

Application filed ,December 17, 1923. i Serial No. 6315179.

My invention relatesto aimeans' for'preventing pston slap in an internalcombustion engine i particularly i during the power stroke.

An object of the invention is to provide an internal combustion enginein which a pisten and crank are directly connected by a c0n-'` nectingrod, with means incorporated with the pisten and cooperating'with meansprovided in the crank case tor preventing rocking of the piston and theattendant deletei rious effects.

the foregoing, will be set Orth in the follow-' ing description of thepreferred form of my invention which is illustrated in thedrawingsaccompanying and forming part of the specfication. It is tobeunderstood that I do not limit myself to the showing made by the saiddrawings and description, as I may adopt variations of the preferredform with-' in the scope of my invention as set forth'in the claims.

Referring to said drawings:

Figure `l is a longitudinal sectional view ot' an engine equipped withthe means of my invention. r

Fgure 2 is a View similar to. that of Figure l showing a modified formof the means.

As is well known, the pisten and cylinder of an internal combustionengine of the usual type are subjected to considerable frictional wearon one sidedue to the rocking of the pisten during the explosion stroke.This 5 rocking is due to the fact that the connecting rod is angularlydisposed with respect to the axis of the cylinder during the working'stroke, and, theretore, eXerts a transversely acting thrust against thecylinder wall through the piston at the side away from 'to move in theproper path even though the .s

which the connecting rod moves during the i first half ofsaid StrokaMany attempts r have here'tofore heenmade to remedy this objectionablefeature, but the majority of such attempts, in accompl ishing thedesired end, 5 have more or less impaired the' efiiciency of the enginef Inaccordance,-however, with my inventionthe objectionable side. play ofthe pisten isnot only elninated but theoper atingefliciency of theengine is fully preserved. a p V Briefiy expressed, themeansofmyinvention in the preferred emloodiment comprises a pisten havingincorporated therewith a ri-gid .yoke` which 'extends' longitudinallysi', a

thereof and encirclesthe connecting rod and crankf pin. Cooperatingguide members` are provided on the yoke and crank case which q serve toguide the yoke for movement parallel to theaXis of the cylinder during'the reciprocation of the piston and thereby prevent rocking of thepisten; 'Means are a lso pro- Vided 'or supplementing the' guidingaction of: theguide members and causing the. piston side of'the pistenand cylinder have become i 'A detailed description follows 1- i Ashereinbefore stated the means of my invention is adapted. for use? inconnection with .an internal combustion engine in whichthe crankandpiston are directly connected by. a oonnecting rod, Accordingly, inthe drawings'theengine 4 is provided with a piston 5 which is mounted'tor reciprocation in a cylinder 6-and is operatively connected to 'thecrank shaft 7 by means ofaconnecting red 8 andcrank 9. w a Rigidlyjfixlto the pistOIl,-Qf which it is virtually a part, by means of bolts 12Or theffl :likeand extendingintothecranlrcase 13 is ayokeor strap let'prefrably of segmental crosssection. Theyoke 14, together .with thepisten properextends completely 'around thec'onnectingrod including thewrist pin 16 andcrankpin 1.7, and defines. a plane paral-' l'el .to the;plane-of motion ofthe connecting rod. Due to the position of the yokerelative to the connecting rod, the formeris .of such shape as to notinterf ere with the oscillation '21 oI" the connecting rod. Fixed to theyoke, preferably at a point longitudinally aligned with the cyIinder,which point is preferably most remote from the piston proper, is anextension 18 which is in slidable engagement with a guideway 19 formedin the wall 21 of the crank-case 13. As here shown, the extension 18 isin the form of a cylndrical rod 22 which moves ina direction parallel tothe aXis of the cylinder 'and reciprocates in the cylindrical bore 23013'the uideway" 19.' i It will thus be noted that the portion of thepiston engaging the 'walls of the cylinder will be prevented from movingin any direction other than axially of the cylinder. Thus rocking of thepiston is absolutely prevented.

The piston proper is provided with cored walls, so that the combinedweight of the piston including the yoke portion is no more than theweight of the usual piston, and since the side thrust of the piston isdistributed so that the unit pressure on the bearing surfaces involvedis reduced to a minimum, 'wear of the 'parts will be correspondinglyreduced and the efiiciency of the engine will be preserved. e i

Adjustably positioned in the crank case is a roller '31 which isadapt'ed to bear against the side 32 of the piston from which theconnecting rod moves during the first part of the-working stroke. 'Inthis manner, if the side 32 of the piston or the cylinder wall portion33 engaged thereby becomes worn the roller may be adjusted to cooperatewith the guide members 18 and 19 to hold the piston to its proper path.i V

-In Figure 2, a slightly 'modified form of guiding means is shown; Inthis 'embodie ment, extensions 34: at opposite sides of there'ciprocation therein; a connecting rod at one end of the piston; saidpiston being reduced in cross sectional area adjacent said rod wherebysuch reduced piston will be kept spaced from the walls of the cylinderwhen disposed therein; a yoke member rigidfly fixed at an end to, andforming an extension of, the piston and disposed about said rod:

'means adj acent the other end of said yoke for yoke are formed withhearing faces 36 which 4 are arranged to engage hearing surfaces 37provided on the adjacent sides of the crank case.

I clam: i 1. In an internal combuston engine, the

combination with a piston mounted for recipton at the side away fromwhich the connecti i ing rod swings during the first part of the powerstroke. p

2. In a piston guiding means, the combination with a cylinder, a pistonmounted .for recprocaton theren and a connecting rod at one end of thepiston; said piston being reduced m'cross sectonal area adjacent saidrod: Whereby ch reduced portion will'be I\ kept spaced from the walls ofthe cylinder U i 'when disposed therein, and an adjustable non-frctonhearing member arranged to engage said reduced portion of the pistonduring the reciprocation thereof.

3. In piston guidng means; the combination with a cylinder; a piston'nountedtor

